Hi Speed Sorting

William King wking at aecom.yu.edu
Mon Jan 8 15:18:52 EST 2007

I have been sorting bacteria using a MoFlo two or three times every  
week for approximately 3 hours per sort since last February and have  
had zero contamination issues. Afterward the sort, I run freshly  
prepared 10% Chlorox for one hour at high sample pressure though  
there have been times that I have done this for as little as 15  
minutes; still without any issues. I do pay particular attention to  
the cleanliness of the top of the bacteria sort sample tube so as to  
not have bacteria contact the o-ring that fits onto the sort tube.

Flow Cytometry Core Facility
Albert Einstein College of Medicine

On Jan 7, 2007, at 6:30 PM, Rbwadley wrote:

> Dear Stephen,
> I used to run a Moflo MLS High Speed Sorter at the
> University of NSW, Australia. On any given day I
> could sort and/or analyse bacteria, Giardia, mouse, rat, human  
> cells or fungi.
> In 3 1/2 years I did not have a single proven case
> of cross contamination.
> If you consider how a sorter (or analyser) works the
> only part of the instrument that comes in direct
> contact with the sample is the sample line. If the
> sample line is properly cleaned (I used bleach for a
> couple of minutes followed by distilled water for a
> couple of minutes), there is no problem. I could
> see a problem if the sample was left in the
> instrument after it was shut down overnight, but I
> would hope that scenario would never happen.
> I currently run a FACSAria at MMRI in Brisbane, and
> again, with even minimal cleaning between sorts I
> find zero cross contamination, although my samples
> here are limited to mouse or human cells.
> Regards
> Rob Wadley
> > --------- Original Message --------
> > From: Stephen.Rosenberg at jefferson.edu
> > To: cyto-inbox <cytometry at flowcyt.cyto.purdue.edu>
> > Subject: Hi Speed Sorting
> > Date: 21/12/2006 05:14
> >
> > I was wondering the following. If people were
> > utilizing a a high-speed sorter in order to
> > sort bacteria, should one be concerned if they
> > were to sort mammalian cells on the same
> > sorter as to whether there could be any
> > contamination of the mammalian cells by either
> > bacteria themselves or by bacterial
> > products,i.e.-endotoxins.
> >
> > Thanks
> >
> > Steve
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Whenever you find you are on the side of the majority, it is time to  
pause and reflect.
Samuel Clemens (1835-1910)

C. William King
Flow Cytometry Core Facility
Albert Einstein College of Medicine
1300 Morris Park Avenue, C309
Bronx, New York 10461

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